Fuel-injecting device for internal-combustion engines.



A. MARHENKE, FUEL INJECTING. DEVICE FOR INTERNAL COMBUSTION ENGINES.

APPLICATION FILED DEC. 12, I913.

Patented Apr. 18, 1916.

AUGUST MARHENKE, OF KIEL-GAARDEN, GERMANY.

Specification o a fuel injecting device for internal combustion engines, which is intended to enable difficultly ignitible fuels to be used.

The invention will be described with reference to the accompanying drawing, in

Figure 1 shows the fuel nozzle and a portion of the engine cylinder 'in a vertical sec tion taken through the axis of the cylinder, the other portions of the apparatus being illustrated diagrammatically, while Figs. 2 and 3 show diagrammatically portions of two other constructional forms, The constructional form shown in Fig. 1

will be described first.

Into the cover B of the cylinder A of an injection internal combustion engine is built in the usual way the fuel injecting valve C. Into this valve, which is normally closed toward the interior of the cylinder by a controlled fuel needle D, open, in addition to the pipe H for the compressed air for injecting the fuel, two fuel passages F and G, one of which (F) leads to the space above the atomizer disks of-an ordinary disk atomizer E, and the other passage (G) to an annular space 0 immediately above the needle seat. The two fuel supply passages F and G are supplied through two pipesf and 9 which branch off from' a pipe L 4.0 leading from the fuel pump (not shown). In the branch pipe f is fitted a nonreturn valve J loaded with a spring-i and in the branch pipe 9 is fitted a valve K, which a spring 10 tends to close. This valve K at isso connected tothe governor M of the engine, that whenthe load on the engine decreases it is opened from a certain position of the governor sleeve m onward against the pressure of the spring k For this purpose the spindle. is? of the valve K is connected to the piston rod W, of an auxiliary motor N worked by oil under pressure. The supply and discharge of the oil under FUEL-1N3 JECTING DEVICE FOR INTERNAL-COMBUSTION ENGINES.

e ters Patent.

Patented Apr. 16, T9 16.

Application filed December 12, 1913. Serial No. 806,326.

pressure is regulated by a distributing valve P operated by the governor M, and to which as are connected a supply pipe 9 for the oil under pressure .and an exhaust pipe q, for the oil under pressure, and from which a pipe 9 for the oil under pressure leads to the space, in the auxiliary motor N, situated above the piston. A spring n acts'upon the lower piston face of the auxiliary motor N. l

. The description of the working of the above described apparatus will be commenced from the position of the various parts shown in Fig.

1, which is the position they assume when the engine is under a light load (from about half load or downward). The engine then runs at a fairly high number of revolutions and the governor sleeve m is comparatively high up. It has at the same time carried up with it the distributing valve P for the oil under pressure, and this'latter has connected the supply pipe 9 for the oil under pressure through the pipe 9 with the auxiliary motor N, the piston of which has consequently moved downward and has opened the valve K with the'simultaneous compression of the springs n and is. As the valve J is kept closedby its spring 71 the fuel supplied by the fuel pump passes through L 9 K g G into the annular space situated 'above the seat of the needle and, on the opening of the'fuel needle, the fuel is carried along by the compressed air for injection directly into the cylinder. From about half load or downward to no load at all, there is fuel close over the seat of the needle, so that even when the nozzle is completely blown empty, miss fires are not to be feared. If now the governor sleeve drops as the load increases the distributing valve P for p .the oil under pressure moves downward.

As it does so it firstcuts off the supply of oil under pressure through the pipe g to the auxiliary motor N, and then connects this latter with 'thedischarge pipe 9 for the oil under pressure. With the disappearance of the pressure acting upon the top of the piston of the auxiliary motor N, the piston moves upward under the action of the expanding springs n k and the valve K closes automatically. The fuel now pursues its course over L J i F over the disk atomizer, and on the opening of the fuel by the compressed actuated valve.

of. the engine,

- an arm T, the pivot Fig. 1.

needle D the. fuel is forced into the cylinder air, after passing through the atomizerE. v

The constructional forms diagrammatically shown in Figs. 2 and 3 differ substantially from the constructional example just described, in deriving from thevalve shaft the power for holding open the valve K. In the constructional form shown in Fig. 2 a cam S, mounted on the Valve shaft R,.rocks t of which, when the overnor sleeve m is in the raised osition g 7 is held in such a position by a bell crank lever provided on the other end of the arm T strikes against the arrangement U U that the contact edge 25 of the valve shaft and at the time of the fuel supply. When the load. is great and the governor sleeve m} therefore in-its 10W position, the pivot t of the rock arm T is in such a position with relation to the valve spindle k that the contact edge-2, does not strike against the valve spindle k at all.

In the constructional form shown in Fig. 8,-the pushing open of the valve K fected through the medium of a pusher rod by a cam disk'V mounted on the valve shaft R. The valve is however only opened Ywhen the engine is under a light load, that is to say when the governor sleevem is in a raised position, as itis, only then that a wedge Z, operated by the governor, establishes the connection between the pusher rod W and the valve spindle 10 The two constructional illustra d in Figs. 2 and work in principle, in exactly the same manner as the constructional form illustrated in forms partially I claim:'

' 1. In a fuel injecting device for internal combustion engines having an atomizer and a main fuel conduit, opening to the rear of the atomizer and an auxiliary fuel conduit, having an inlet opening in front of the at- 01111261; a spring loaded, non-return valve -and a normally closed valve both in'said auxiliary conduit and means for opening said'valve when the engine is running with a light load, said means comprising a speed 2. vIn a fuel injecting device for internal combustion engines, having an atomizer and a main fuel conduit,-opening to the rear of the atomizer and an auxiliary fuel conduit, opening in; front of the atomizer; a spring loaded, non-return valve and a normally said auxiliary conduit and means for opening said second valve,

sald means being actuated by the governor whereby said second valve w1ll be' opened only when the engine runs with a light load. c

' 3. In a fuel injecting device for internal valve spindle and pushes open the valve K at each revolution 3 will therefore loaded, non-return valve and a normally 70 closed valve, both in said auxiliary conduit and means for opening said normally closed valve when the engine 1s running with a light load; said means comprising a pressure fluid driven motor having positive connec- 5 tion with said normally closed valve, the admittance of pressure fluid into said motor being actuated by the governor of the engine.

. u 4. In a fuel i jecting device for internal go combustion engines having an atomizer and a main fuel conduit, opening to the rear of the atomizer andan auxiliary fuel conduit, opening in front of the atomizer; a normally closed valve 1n said auxiliary conduit and means for opening said valve when the engine is running with a light load; said means comprising a pressure fluid driven moto: having positive connection with said valve,

a pressure fluid conduit leading to said inotor and a valve'm said pressure fl111d0011- duit, said last named valve being opened by the engine governor when the load on the engine is light.

'5. In a fuel injecting device for internal combustion engines having an atomizer and a main fuel conduit, opening to the rear of the atomizer and an auxiliary fuel conduit, opening in front of the atomizer; a springloaded, non-return .valve and closed valve both in said auxiliary conduit and means for opening said normally closed valve when the engine is running with a light load; said means comprising a pressure fluid driven motor having a plston posl- 1 'tively connected with said normally closed va ve, a spring acting on said piston in the direction of closing said valve, a pressure fluid conduit opening on the opposite side of said piston, conduit, said last named valve being actuated by the engine governor, to admit pressure fluid into said motor and thereby ,opening said normally closed valve for admittin fuel in front of the atomizer, when the load 115 on the engine is light.

6. In a fuel injecting device for internal combustion engines having an atomizer and a main fuel conduit, opening to the rear of the atomizer and an auxiliary fuel conduit,

atomizer; a springopening in front of the loaded, non-returnable valve both in saidauxiliary conduit and means foropening said normally closed valve when the engine isrunning comprising a pressure fluid driven motor havmg. a piston positively connected with said normally closed on said 'saidval valve, a spring acting plston in the direction-of closing a normally 10 a valve in said. pressure fluid w1th a light load; said means ve, a pressure fluidconduit opening memes on the opposite side of said piston, a valve in said pressure fluid conduit, said last named Valve being actuated by the engine governor, to admit pressure fluid into said thereby, closing said normally closed valve 1t) and admitting fuel to the engine through said main conduit only.

In testimony whereof I have afixed my signature in presence of two witnesses.

AUGUST MARHENKE.

Witnesses:

JULIUS Borne, .A. MI'J'LLER. 

